Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 200mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke200 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-40S
The AirTAC SAIJ125X200-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a usable travel window between 160 and 200 mm. Built with a SUS420J2 stainless steel rod and PT tapered ports, it delivers a robust 6136N push force at 0.5 MPa. The integrated -S magnet enables direct mounting of CMSE reed or DMSE electronic sensors along the dual-side extruded barrel grooves.
This adjustable-stroke design allows you to fine-tune the retract end position during commissioning without swapping the cylinder or adding external stops. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure. For applications requiring true position holding, consider the SAIL or BSAI locking cylinder variants.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 200 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×200 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-40S Is Used
Variable End-Stop Positioning
Dial in the exact retract distance between 160 and 200 mm during machine commissioning to accommodate varying material thicknesses without external spacers.
Product Size Changeover
Quickly adjust the stroke end position on packaging lines when switching between different package dimensions, ensuring precise stops on the fly.
Heavy-Duty Clamping Setups
Leverage the 6136N push force at 0.5 MPa to secure heavy workpieces, using the fine-tune adjustment to set the exact clamping depth safely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-40S the Right Cylinder?
Choose this 125 mm bore when you need heavy thrust beyond the 3927N push force of a 100 mm cylinder, but less than the 10053N delivered by the 160 mm size. The adjustable 40 mm travel window is ideal for product changeovers on a line, letting you dial in the exact end-stop without machining new hard stops. If your machine requires load holding without continuous air, select a SAIL or BSAI cylinder instead, as the SAIJ adjuster is not a brake.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 200 mm nominal stroke, 40 mm adjustment range, PT port threads, and -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. For this 200 mm stroke, the 32 mm rod diameter handles high side loads well, but always guide the load externally to prevent binding.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-40S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides a push force of 6136N and a pull force of 5734N. It can reach a maximum push force of 11045N at 0.7 MPa.
The rear stopper screw lets you mechanically shorten the 200 mm nominal stroke by up to 40 mm, providing a usable travel window of 160 to 200 mm. This stopper only sets the travel end and does not lock the load without live air pressure.
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